3956561 has 8 divisors (see below), whose sum is σ = 4667904. Its totient is φ = 3281760.

The previous prime is 3956549. The next prime is 3956569. The reversal of 3956561 is 1656593.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3956561 - 2¹⁴ = 3940177 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3956569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8900 + ... + 9333.

It is an arithmetic number, because the mean of its divisors is an integer number (583488).

Almost surely, 2^3956561 is an apocalyptic number.

3956561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3956561 is a deficient number, since it is larger than the sum of its proper divisors (711343).

3956561 is a wasteful number, since it uses less digits than its factorization.

3956561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18271.

The product of its digits is 24300, while the sum is 35.

The square root of 3956561 is about 1989.1106052706. The cubic root of 3956561 is about 158.1633865051.

Subtracting from 3956561 its reverse (1656593), we obtain a cube (2299968 = 132³).

The spelling of 3956561 in words is "three million, nine hundred fifty-six thousand, five hundred sixty-one".